Fair Value Measurement (Tables)

9 Months Ended

Sep. 30, 2012

Fair Value Disclosures [Abstract]

Financial Assets And Liabilities Measured At Fair Value On A Recurring Basis

The following table presents for each of these hierarchy levels, the Company’s financial assets and liabilities that are measured at fair value on a recurring basis:

	Level I		Level II		Level III		Total
At September 30, 2012:
Assets:
Cash equivalents (a)	$	287,100	$	—	$	—	$	287,100
Liabilities:
Interest rate swap contracts	$	—	$	24,429	$	—	$	24,429
At December 31, 2011:
Assets:
Cash equivalents (a)	$	202,276	$	—	$	—	$	202,276
Liabilities:
Interest rate swap contracts	$	—	$	19,091	$	—	$	19,091

(a) Represents the Company’s investment in money market funds.

Carrying Values And Fair Values Of The Company's Financial Instruments

The carrying values and estimated fair values of the Company’s financial instruments, excluding those that are carried at fair value in the consolidated balance sheets are summarized as follows:

	September 30, 2012
	Carrying Amount		Estimated Fair Value
Debt instruments:
Credit facility debt	$	1,502,479	$	1,495,866
Senior notes	687,169		791,000
	$	2,189,648	$	2,286,866
	December 31, 2011
	Carrying Amount		Estimated Fair Value
Debt instruments:
Credit facility debt	$	1,604,846	$	1,550,960
Senior notes	686,434		761,250
	$	2,291,280	$	2,312,210